Epidermal cyst

This code represents a benign, slow-growing cyst that originates from the epidermis and is filled with keratinous material. It typically presents as a firm, movable, subcutaneous nodule, often with a central punctum. These cysts are commonly found on the face, neck, trunk, and scrotum.

Use this code when documentation clearly identifies an epidermal cyst, also known as an epidermoid cyst or infundibular cyst. This diagnosis is typically made clinically based on appearance and palpation, though histopathology confirms the diagnosis after excision.

• Differentiate from sebaceous cysts (steatocystoma), which originate from sebaceous glands and are coded differently.
• Ensure documentation specifies "epidermal" or "epidermoid" to avoid confusion with other types of skin cysts.
• Do not use for pilar cysts (trichilemmal cysts), which are distinct and have a different code.